Fort.14: Grid and Boundary Information File

The fort.14 file contains the finite element grid, the bathymetric data, and the boundary information used by ADCIRC. This file is required to run the ADCIRC model.

File Structure

The basic file structure is shown below. Each line of input data is represented by a line containing the input variable name(s). Loops indicate multiple lines of input. Conditional input is indicated by a clause following the variable name(s).

AGRID
NE, NP
for k=1 to NP
   JN(k), X(k), Y(k), DP(k)
end k loop
for k=1 to NE
   JE(k), NHY(k), NM(k,1), NM(k,2), NM(k,3)
end k loop
NOPE
NETA
for k=1 to NOPE
   NVDLL(k), IBTYPEE(k)
   for j=1 to NVDLL(k)
      NBDV(k,j)
   end j loop
end k loop
NBOU
NVEL
for k=1 to NBOU
   NVELL(k), IBTYPE(k)
   for j=1 to NVELL(k)
      NBVV(k,j)      if IBTYPE(k) = 0, 1, 2, 10, 11, 12, 20, 21, 22, 30
      NBVV(k,j), BARLANHT(k,j), BARLANCFSP(k,j)      if IBTYPE(k) = 3, 13, 23
      NBVV(k,j), IBCONN(k,j), BARINHT(k,j), BARINCFSB(k,j), BARINCFSP(k,j)      if IBTYPE(k) = 4, 24, 64
      NBVV(k,j), IBCONN(k,j), BARINHT(k,j), BARINCFSB(k,j), BARINCFSP(k,j), PIPEHT(k,j), PIPECOEF(k,j), PIPEDIAM(k,j)      if IBTYPE(k) = 5, 25
   end j loop
end k loop

Normal Flux Boundary Types

The table below describes the valid IBTYPE values and their corresponding boundary condition types. See also IBTYPE for full details of each boundary type.

Normal Flux Boundary Type Values (IBTYPE)

IBTYPE	Location	Flux Type	Num. Impl.	Tang. Slip	Typical Use
0	External	Zero	Essential	Free	Mainland boundaries
1	Internal	Zero	Essential	Free	Island boundaries
2	External	Nonzero inflow	Essential	Free	River or ocean inflow boundaries; if flux is periodic it is specified in fort.15; if it is time varying and aperiodic, it must be specified in fort.20 file
3	External	Outflow	Essential	Free	Flow over a weir out of the domain; must specify levee height; ADCIRC calculates the fluxes
4	Internal	Zero or nonzero	Essential	Free	Interior levees; must specify levee height; ADCIRC calculates the fluxes using weir formula
5	Internal	Zero or nonzero	Essential	Free	Interior levees with cross-barrier pipes (like a culvert); must specify levee height and other parameters; ADCIRC calculates the fluxes
10	External	Zero	Essential	No slip	As ibtype 0 above but no slip
11	Internal	Zero	Essential	No slip	As ibtype 1 above but no slip
12	External	Nonzero	Essential	No slip	As ibtype 2 above but no slip
13	External	Outflow	Essential	No slip	As ibtype 3 above but no slip
20	External	Zero (weak)	Natural	Free	As ibtype 0 but natural boundary; preferred over ibtype 0 or 10
21	Internal	Zero (weak)	Natural	Free	As ibtype 1 but natural boundary; preferred over ibtype 1 or 11
22	External	Nonzero (weak)	Natural	Free	As ibtype 2 but natural boundary; preferred over ibtype 2 or 12
23	External	Outflow (weak)	Natural	Free	As ibtype 3 but natural boundary; preferred over ibtype 3 or 13
24	Internal	Zero or nonzero (weak)	Natural	Free	As ibtype 4 but natural boundary; preferred over ibtype 4
25	Internal	Zero or nonzero (weak)	Natural	Free	As ibtype 5 but natural boundary; preferred over ibtype 5
64	Internal	Zero or nonzero (weak)	Natural or condensed	Free	Defines vertical element walls
102	External	Nonzero inflow	Essential	Free	As ibtype 2 but baroclinic instead of barotropic; also requires density-related boundary conditions in fort.39 input file
112	External	Nonzero	Essential	No slip	As ibtype 12 but baroclinic instead of barotropic; also requires density-related boundary conditions in fort.39 input file
122	External	Nonzero (weak)	Natural	Free	As ibtype 22 but baroclinic instead of barotropic; also requires density-related boundary conditions in fort.39 input file

Note

Abbreviations in column headers:

• Num. Impl. - Numerical Implementation

• Tang. Slip - Tangential Slip

Note

Different boundary types require different parameters to be specified in the fort.14 file:

• Basic boundaries (IBTYPE = 0, 1, 2, 10, 11, 12, 20, 21, 22, 102, 112, 122): Node numbers only

• Weir boundaries (IBTYPE = 3, 13, 23): Node numbers plus barrier height and flow coefficients

• Interior barrier boundaries (IBTYPE = 4, 24): Node numbers, connected nodes, barrier height, and flow coefficients

• Pipe boundaries (IBTYPE = 5, 25): Node numbers, connected nodes, barrier parameters, and pipe specifications (height, coefficient, diameter)

Example

The following is a simple example of a fort.14 file for a small domain with 3 elements and 4 nodes:

Simple ADCIRC domain
3 4
1 0.0 0.0 -10.0
2 1.0 0.0 -10.0
3 1.0 1.0 -10.0
4 0.0 1.0 -10.0
1 3 1 2 3
2 3 1 3 4
3 3 2 3 1
1 4
1 0
1
2
3
4
0 0